Global slavery index

"The inaugural edition of the Global Slavery Index 2013 provides a ranking of 162 countries around the world, based on a combined measure of three factors: estimated prevalence of modern slavery by population, a measure of child marriage, and a measure of human trafficking in and out of a country. The Index provides a quantitative ranking of 162 countries around the world according to the estimated prevalence of slavery, that is, the estimated percentage of enslaved people in the national population at a point in time. The Index also provides an estimate of the size of the modern slavery problem, country by country."